NBC Nightly News anchor and managing editor Brian Williams traveled to Moscow this week for an exclusive, wide-ranging interview with Edward Snowden. The former NSA contractor’s first-ever American television interview will air in an hour-long NBC News primetime special on Wednesday, May 28 at 10 p.m. Eastern/9 p.m. Central.

Williams’ in-person conversation with Snowden was conducted over the course of several hours and was shrouded in secrecy due to Snowden’s life in exile since leaking classified documents about U.S. surveillance programs a year ago. Williams also jointly interviewed Snowden and journalist Glenn Greenwald, who has reported stories based on the documents in media outlets around the world, about how they came to work together and the global debate sparked by their revelations.